DTMF Digit Mask Control for Secure Media Gateway Storage
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Solution Overview
Problem
In packet-based networks with separated service and media functions, sensitive user input information such as identity card numbers or credit card numbers are indiscriminately stored by Media Gateways, compromising information security.
Innovation Solution
A method and system that utilize DTMF digit mask control information to determine whether to store DTMF digit information, where this control information is used to decide whether to store user input data, preventing indiscriminate storage of sensitive contents by indicating suitable storage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Media Gateway stores all received DTMF digit information, then the information is preserved for processing, but sensitive user data security is compromised
Solution Approach 1:
The patent applies local quality by differentiating the storage treatment of different types of information. Instead of uniformly storing all DTMF digit information, the system selectively stores only non-sensitive information while protecting sensitive data. This is achieved by classifying information based on sensitivity characteristics and applying different storage policies to different classes, thereby maintaining security while preserving necessary information.
Solution Approach 2:
The patent implements preliminary action by pre-configuring sensitivity masks that define which DTMF digit patterns represent sensitive information. These masks are established before actual information storage occurs, allowing the system to proactively identify and protect sensitive data. The sensitivity masks are configured in advance and used to control storage decisions, preventing security issues before they arise.
2Reliability
If the Media Gateway stores no DTMF digit information, then information security is maintained, but necessary service processing is impaired
Solution Approach 1:
The system applies local quality by selectively storing only the specific portions of DTMF information that are necessary for service processing while excluding sensitive portions. This selective approach ensures that service functionality is maintained through storage of essential data, while security is preserved by excluding sensitive data from storage.
3Loss of information
If the Media Gateway indiscriminately stores all user input, then complete information is preserved, but information security risks increase
Solution Approach 1:
The patent resolves this contradiction by applying different storage qualities to different information characteristics. Non-sensitive information is stored completely to maintain information completeness for service processing, while sensitive information is excluded from storage to eliminate security risks. This differentiated approach achieves both goals simultaneously.
Solution Approach 2:
The system uses pre-configured sensitivity masks to identify sensitive information before storage decisions are made. This preliminary identification allows the system to proactively exclude sensitive data from storage, preventing security risks before they can materialize, while still storing complete non-sensitive information.
Data Source
AI summary
When receiving Dual Tone Multi-Frequency (DTMF) information, we provide a way to determine whether to store such, which may include sensitive user input information. More specifically, a media gateway (MG) obtains DTMF digit mask control information, which indicates whether DTMF digit information may include sensitive user input information not suitable for storage. Based thereon, it decides, whether to store the received DTMF digit information. In this way, the DTMF digit mask control information controls whether to store the user input information on the DTMF digit information processing device in the architecture with the service function being separated from the bearing function; thus, avoiding information security risks brought by indiscriminate storage of sensitive contents in the user input information.